Authorities on Friday released surveillance photos of two men dressed as security guards who used demand notes to rob bank tellers in San Marcos.

The robbers entered the Mission Federal Credit Union on Las Posas Road near Grand Avenue about noon Thursday. They approached separate tellers, handing them notes and then demanding cash.

Both tellers thought the men were security guards based on their clothes, the FBI said.

No weapons were seen, but the tellers were threatened, the FBI said. The robbers stuffed cash of various denominations into their pockets and a white cloth bag before walking out together.

The first robber was described as black, in his late 20s, heavyset, 5 feet 8 inches to 6 feet tall, wearing a dark blue heavy jacket with patches on each arm, a dark beanie cap, dark pants and white gloves.

The second man was described as black, in his mid-20s, heavyset, 6 feet to 6 feet 2 inches tall, possibly with a slight mustache and goatee. He was wearing a dark blue or black jacket, possibly a Windbreaker, a light gray shirt with vertical stripes, light gray sweatpants and white gloves.

Anyone with information is asked to call the FBI at (858) 565-1255, the Sheriff’s Department at (858) 565-5200, or San Diego Crime Stoppers at (888) 580-8477.

Tipsters who call Crime Stoppers may remain anonymous and could be eligible for a reward of up to $1,000.